Light guide plate, front light source module, display module and display device

Abstract

A light guide plate comprises a light guide plate body having a first light emitting surface, a second light emitting surface which is opposite to the first light emitting surface, and a plurality of side surfaces which connect the first light emitting surface and the second light emitting surface. The light guide plate further comprises a plurality of phosphor grid dots arranged on the first light emitting surface and a reflection layer arranged on each of the phosphor grid dots. The phosphor grid dots are capable of generating excitation light after being irradiated by light from a light source. The reflection layer is configured to reflect the excitation light of the phosphor grid dots to the light guide plate body. Embodiments of the present disclosure also provide a front light source module, a display module and a display device.

What is claimed is: 
     
       1. A light guide plate, comprising:
 a light guide plate body having a first light emitting surface, a second light emitting surface which is opposite to the first light emitting surface, and a plurality of side surfaces which connect the first light emitting surface and the second light emitting surface and at least one of which serves as a light incident surface; 
 a plurality of phosphor grid dots arranged on the first light emitting surface; and 
 a reflection layer arranged on each of the phosphor grid dots, 
 wherein the phosphor grid dots are capable of generating excitation light after being excited by light from a light source, and the reflection layer is configured to reflect the excitation light of the phosphor grid dots to the light guide plate body. 
 
     
     
       2. The light guide plate according to  claim 1 , wherein the phosphor grid dots are regularly distributed on the first light emitting surface of the light guide plate body and dimensions of the phosphor grid dots are gradually increased along a direction away from the light incident surface. 
     
     
       3. The light guide plate according to  claim 1 , wherein a distribution density of the phosphor grid dots on the first light emitting surface of the light guide plate body is gradually increased along the direction facing away from the light incident surface. 
     
     
       4. The light guide plate according to  claim 1 , wherein the phosphor grid dots comprise mixed phosphor formed by mixing green phosphor of BaMgAl 10 O 17 :Eu 3+ :Mn 2+  and red phosphor of Y 2 O 2 S:Eu 3+ , or the phosphor grid dots comprise yellow phosphor of YAG:Ce. 
     
     
       5. The light guide plate according to  claim 2 , wherein the phosphor grid dots comprise mixed phosphor formed by mixing green phosphor of BaMgAl 10 O 17 :Eu 3+ :Mn 2+  and red phosphor of Y 2 O 2 S:Eu 3+ , or the phosphor grid dots comprise yellow phosphor of YAG:Ce. 
     
     
       6. The light guide plate according to  claim 3 , wherein the phosphor grid dots comprise mixed phosphor formed by mixing green phosphor of BaMgAl 10 O 17 :Eu 3+ :Mn 2+  and red phosphor of Y 2 O 2 S:Eu 3+ , or the phosphor grid dots comprise yellow phosphor of YAG:Ce. 
     
     
       7. The light guide plate according to  claim 1 , wherein light guide plate body is flat plate-shaped or wedge-shaped. 
     
     
       8. A front light source module, comprising the light guide plate according to  claim 1 . 
     
     
       9. A front light source module, comprising the light guide plate according to  claim 2 . 
     
     
       10. A front light source module, comprising the light guide plate according to  claim 3 . 
     
     
       11. The front light source module according to  claim 8 , wherein the phosphor grid dots comprise mixed phosphor formed by mixing green phosphor of BaMgAl 10 O 17 :Eu 3+ :Mn 2+  and red phosphor of Y 2 O 2 S:Eu 3+ ;
 the front light source module further comprises:
 an ultraviolet LED light source which is disposed on the side of the light incident surface of the light guide plate body, and 
 an absorbing sheet configured to absorb ultraviolet light which is disposed above the first light emitting surface of the light guide plate body. 
 
 
     
     
       12. The front light source module according to  claim 8 , wherein the phosphor grid dots comprise yellow phosphor of YAG:Ce;
 the front light source module further comprises a blue LED light source which is disposed at the side of the light incident surface of the light guide plate body. 
 
     
     
       13. The front light source module according to  claim 9 , wherein the phosphor grid dots comprise mixed phosphor formed by mixing green phosphor of BaMgAl 10 O 17 :Eu 3+ :Mn 2+  and red phosphor of Y 2 O 2 S:Eu 3+ ;
 the front light source module further comprises:
 an ultraviolet LED light source which is disposed on the side of the light incident surface of the light guide plate body, and 
 an absorbing sheet configured to absorb ultraviolet light which is disposed above the first light emitting surface of the light guide plate body. 
 
 
     
     
       14. The front light source module according to  claim 9 , wherein the phosphor grid dots comprise yellow phosphor of YAG:Ce;
 the front light source module further comprises a blue LED light source which is disposed at the side of the light incident surface of the light guide plate body. 
 
     
     
       15. The front light source module according to  claim 10 , wherein the phosphor grid dots comprise mixed phosphor formed by mixing green phosphor of BaMgAl 10 O 17 :Eu 3+ :Mn 2+  and red phosphor of Y 2 O 2 S:Eu 3+ ;
 the front light source module further comprises:
 an ultraviolet LED light source which is disposed on the side of the light incident surface of the light guide plate body, and 
 an absorbing sheet configured to absorb ultraviolet light which is disposed above the first light emitting surface of the light guide plate body. 
 
 
     
     
       16. The front light source module according to  claim 10 , wherein the phosphor grid dots comprise yellow phosphor of YAG:Ce;
 the front light source module further comprises a blue LED light source which is disposed at the side of the light incident surface of the light guide plate body. 
 
     
     
       17. A display module, comprising a display panel, a reflection plate, and the front light source module according to  claim 8 ,
 wherein the front light source module is disposed at the side of a display surface of the display panel; 
 in the front light source module, the second light emitting surface of the light guide plate body faces towards the displaying surface of the display panel; and 
 the reflection plate is disposed at the side of a non-displaying surface of the display panel. 
 
     
     
       18. A display module, comprising a display panel, a reflection plate, and the front light source module according to  claim 9 ,
 wherein the front light source module is disposed at the side of a display surface of the display panel; 
 in the front light source module, the second light emitting surface of the light guide plate body faces towards the displaying surface of the display panel; 
 the reflection plate is disposed at the side of a non-displaying surface of the display panel. 
 
     
     
       19. A display module, comprising a display panel, a reflection plate, and the front light source module according to  claim 10 ,
 wherein the front light source module is disposed at the side of a display surface of the display panel; 
 in the front light source module, the second light emitting surface of the light guide plate body faces towards the displaying surface of the display panel; and 
 the reflection plate is disposed at the side of a non-displaying surface of the display panel. 
 
     
     
       20. A display device, comprising the display module according to  claim 17 .